61911957 has 8 divisors (see below), whose sum is σ = 83680384. Its totient is φ = 40709088.

The previous prime is 61911947. The next prime is 61911973. The reversal of 61911957 is 75911916.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61911957 - 2⁶ = 61911893 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 (61911907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141133 + ... + 141570.

It is an arithmetic number, because the mean of its divisors is an integer number (10460048).

Almost surely, 2^61911957 is an apocalyptic number.

It is an amenable number.

61911957 is a deficient number, since it is larger than the sum of its proper divisors (21768427).

61911957 is a wasteful number, since it uses less digits than its factorization.

61911957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282779.

The product of its digits is 17010, while the sum is 39.

The square root of 61911957 is about 7868.4151517316. The cubic root of 61911957 is about 395.6017256311.

The spelling of 61911957 in words is "sixty-one million, nine hundred eleven thousand, nine hundred fifty-seven".