69621949 has 2 divisors, whose sum is σ = 69621950. Its totient is φ = 69621948.

The previous prime is 69621931. The next prime is 69621973. The reversal of 69621949 is 94912696.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65448100 + 4173849 = 8090^2 + 2043^2 .

It is a cyclic number.

It is not a de Polignac number, because 69621949 - 2⁷ = 69621821 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 69621899 and 69621908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69921949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34810974 + 34810975.

It is an arithmetic number, because the mean of its divisors is an integer number (34810975).

Almost surely, 2^69621949 is an apocalyptic number.

It is an amenable number.

69621949 is a deficient number, since it is larger than the sum of its proper divisors (1).

69621949 is an equidigital number, since it uses as much as digits as its factorization.

69621949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209952, while the sum is 46.

The square root of 69621949 is about 8343.9768096514. The cubic root of 69621949 is about 411.3852588598.

It can be divided in two parts, 6962 and 1949, that added together give a triangular number (8911 = T₁₃₃).

The spelling of 69621949 in words is "sixty-nine million, six hundred twenty-one thousand, nine hundred forty-nine".