121731057 has 24 divisors (see below), whose sum is σ = 202413120. Its totient is φ = 69055200.

The previous prime is 121731053. The next prime is 121731059. The reversal of 121731057 is 750137121.

It is a happy number.

It is not a de Polignac number, because 121731057 - 2² = 121731053 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121731057.

It is not an unprimeable number, because it can be changed into a prime (121731053) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1807 + ... + 15707.

It is an arithmetic number, because the mean of its divisors is an integer number (8433880).

Almost surely, 2^121731057 is an apocalyptic number.

It is an amenable number.

121731057 is a deficient number, since it is larger than the sum of its proper divisors (80682063).

121731057 is a wasteful number, since it uses less digits than its factorization.

121731057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14053 (or 14050 counting only the distinct ones).

The product of its (nonzero) digits is 1470, while the sum is 27.

The square root of 121731057 is about 11033.1798226984. The cubic root of 121731057 is about 495.6028528857.

Adding to 121731057 its reverse (750137121), we get a palindrome (871868178).

The spelling of 121731057 in words is "one hundred twenty-one million, seven hundred thirty-one thousand, fifty-seven".