61957109 has 16 divisors (see below), whose sum is σ = 65729664. Its totient is φ = 58329600.

The previous prime is 61957073. The next prime is 61957141. The reversal of 61957109 is 90175916.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61957109 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 (61957169) 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, 199064 + ... + 199374.

It is an arithmetic number, because the mean of its divisors is an integer number (4108104).

Almost surely, 2^61957109 is an apocalyptic number.

It is an amenable number.

61957109 is a deficient number, since it is larger than the sum of its proper divisors (3772555).

61957109 is a wasteful number, since it uses less digits than its factorization.

61957109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508.

The product of its (nonzero) digits is 17010, while the sum is 38.

The square root of 61957109 is about 7871.2838215884. The cubic root of 61957109 is about 395.6978722101.

The spelling of 61957109 in words is "sixty-one million, nine hundred fifty-seven thousand, one hundred nine".