61021501 has 2 divisors, whose sum is σ = 61021502. Its totient is φ = 61021500.

The previous prime is 61021487. The next prime is 61021511. The reversal of 61021501 is 10512016.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59305401 + 1716100 = 7701^2 + 1310^2 .

It is a cyclic number.

It is not a de Polignac number, because 61021501 - 2²³ = 52632893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61021511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30510750 + 30510751.

It is an arithmetic number, because the mean of its divisors is an integer number (30510751).

Almost surely, 2^61021501 is an apocalyptic number.

It is an amenable number.

61021501 is a deficient number, since it is larger than the sum of its proper divisors (1).

61021501 is an equidigital number, since it uses as much as digits as its factorization.

61021501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 61021501 is about 7811.6260151136. The cubic root of 61021501 is about 393.6959634925.

Adding to 61021501 its reverse (10512016), we get a palindrome (71533517).

The spelling of 61021501 in words is "sixty-one million, twenty-one thousand, five hundred one".