61698031 has 2 divisors, whose sum is σ = 61698032. Its totient is φ = 61698030.

The previous prime is 61697969. The next prime is 61698037. The reversal of 61698031 is 13089616.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61698031 - 2⁷ = 61697903 is a prime.

It is a super-2 number, since 2×61698031² = 7613294058553922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61698037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30849015 + 30849016.

It is an arithmetic number, because the mean of its divisors is an integer number (30849016).

Almost surely, 2^61698031 is an apocalyptic number.

61698031 is a deficient number, since it is larger than the sum of its proper divisors (1).

61698031 is an equidigital number, since it uses as much as digits as its factorization.

61698031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 61698031 is about 7854.8094184391. The cubic root of 61698031 is about 395.1455555008.

The spelling of 61698031 in words is "sixty-one million, six hundred ninety-eight thousand, thirty-one".