61151985 has 12 divisors (see below), whose sum is σ = 105996852. Its totient is φ = 32614368.

The previous prime is 61151969. The next prime is 61151999. The reversal of 61151985 is 58915116.

61151985 is a `hidden beast` number, since 61 + 1 + 519 + 85 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 34433424 + 26718561 = 5868^2 + 5169^2 .

It is not a de Polignac number, because 61151985 - 2⁴ = 61151969 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 679422 + ... + 679511.

It is an arithmetic number, because the mean of its divisors is an integer number (8833071).

Almost surely, 2^61151985 is an apocalyptic number.

It is an amenable number.

61151985 is a deficient number, since it is larger than the sum of its proper divisors (44844867).

61151985 is a wasteful number, since it uses less digits than its factorization.

61151985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1358944 (or 1358941 counting only the distinct ones).

The product of its digits is 10800, while the sum is 36.

The square root of 61151985 is about 7819.9734654281. The cubic root of 61151985 is about 393.9763807807.

It can be divided in two parts, 6115 and 1985, that added together give a square (8100 = 90²).

The spelling of 61151985 in words is "sixty-one million, one hundred fifty-one thousand, nine hundred eighty-five".