61357997 has 16 divisors (see below), whose sum is σ = 67271040. Its totient is φ = 55780032.

The previous prime is 61357969. The next prime is 61358041. The reversal of 61357997 is 79975316.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61357997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61357937) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44003 + ... + 45375.

It is an arithmetic number, because the mean of its divisors is an integer number (4204440).

Almost surely, 2^61357997 is an apocalyptic number.

61357997 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

It is an amenable number.

61357997 is a deficient number, since it is larger than the sum of its proper divisors (5913043).

61357997 is a wasteful number, since it uses less digits than its factorization.

61357997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1492.

The product of its digits is 357210, while the sum is 47.

The square root of 61357997 is about 7833.1345577617. The cubic root of 61357997 is about 394.4183009644.

The spelling of 61357997 in words is "sixty-one million, three hundred fifty-seven thousand, nine hundred ninety-seven".