45129421 has 2 divisors, whose sum is σ = 45129422. Its totient is φ = 45129420.

The previous prime is 45129377. The next prime is 45129449. The reversal of 45129421 is 12492154.

It is an a-pointer prime, because the next prime (45129449) can be obtained adding 45129421 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44756100 + 373321 = 6690^2 + 611^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-45129421 is a prime.

It is equal to p_2725570 and since 45129421 and 2725570 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 45129421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45129451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22564710 + 22564711.

It is an arithmetic number, because the mean of its divisors is an integer number (22564711).

Almost surely, 2^45129421 is an apocalyptic number.

It is an amenable number.

45129421 is a deficient number, since it is larger than the sum of its proper divisors (1).

45129421 is an equidigital number, since it uses as much as digits as its factorization.

45129421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 28.

The square root of 45129421 is about 6717.8434783791. The cubic root of 45129421 is about 356.0299942114.

The spelling of 45129421 in words is "forty-five million, one hundred twenty-nine thousand, four hundred twenty-one".