61216957 has 2 divisors, whose sum is σ = 61216958. Its totient is φ = 61216956.

The previous prime is 61216951. The next prime is 61216963. The reversal of 61216957 is 75961216.

It is a balanced prime because it is at equal distance from previous prime (61216951) and next prime (61216963).

It can be written as a sum of positive squares in only one way, i.e., 56460196 + 4756761 = 7514^2 + 2181^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61216957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61216951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30608478 + 30608479.

It is an arithmetic number, because the mean of its divisors is an integer number (30608479).

Almost surely, 2^61216957 is an apocalyptic number.

It is an amenable number.

61216957 is a deficient number, since it is larger than the sum of its proper divisors (1).

61216957 is an equidigital number, since it uses as much as digits as its factorization.

61216957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 37.

The square root of 61216957 is about 7824.1265966241. The cubic root of 61216957 is about 394.1158604355.

The spelling of 61216957 in words is "sixty-one million, two hundred sixteen thousand, nine hundred fifty-seven".