61698591 has 10 divisors (see below), whose sum is σ = 92167152. Its totient is φ = 41132340.

The previous prime is 61698589. The next prime is 61698599. The reversal of 61698591 is 19589616.

It is not a de Polignac number, because 61698591 - 2¹ = 61698589 is a prime.

It is a super-2 number, since 2×61698591² = 7613432262770562, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61698599) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 380775 + ... + 380936.

Almost surely, 2^61698591 is an apocalyptic number.

61698591 is a deficient number, since it is larger than the sum of its proper divisors (30468561).

61698591 is an equidigital number, since it uses as much as digits as its factorization.

61698591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761723 (or 761714 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 61698591 is about 7854.8450653084. The cubic root of 61698591 is about 395.1467510054.

The spelling of 61698591 in words is "sixty-one million, six hundred ninety-eight thousand, five hundred ninety-one".