61739957 has 2 divisors, whose sum is σ = 61739958. Its totient is φ = 61739956.

The previous prime is 61739947. The next prime is 61740011. The reversal of 61739957 is 75993716.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60124516 + 1615441 = 7754^2 + 1271^2 .

It is a cyclic number.

It is not a de Polignac number, because 61739957 - 2¹⁶ = 61674421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61739947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30869978 + 30869979.

It is an arithmetic number, because the mean of its divisors is an integer number (30869979).

Almost surely, 2^61739957 is an apocalyptic number.

It is an amenable number.

61739957 is a deficient number, since it is larger than the sum of its proper divisors (1).

61739957 is an equidigital number, since it uses as much as digits as its factorization.

61739957 is an odious number, because the sum of its binary digits is odd.

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

The square root of 61739957 is about 7857.4777759788. The cubic root of 61739957 is about 395.2350403737.

The spelling of 61739957 in words is "sixty-one million, seven hundred thirty-nine thousand, nine hundred fifty-seven".