61021397 has 2 divisors, whose sum is σ = 61021398. Its totient is φ = 61021396.

The previous prime is 61021297. The next prime is 61021409. The reversal of 61021397 is 79312016.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57668836 + 3352561 = 7594^2 + 1831^2 .

It is a cyclic number.

It is not a de Polignac number, because 61021397 - 2²² = 56827093 is a prime.

It is a super-2 number, since 2×61021397² = 7447221783663218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61021297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30510698 + 30510699.

It is an arithmetic number, because the mean of its divisors is an integer number (30510699).

Almost surely, 2^61021397 is an apocalyptic number.

It is an amenable number.

61021397 is a deficient number, since it is larger than the sum of its proper divisors (1).

61021397 is an equidigital number, since it uses as much as digits as its factorization.

61021397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 61021397 is about 7811.6193583661. The cubic root of 61021397 is about 393.6957398314.

The spelling of 61021397 in words is "sixty-one million, twenty-one thousand, three hundred ninety-seven".