61620651 has 24 divisors (see below), whose sum is σ = 91951184. Its totient is φ = 39735360.

The previous prime is 61620649. The next prime is 61620701. The reversal of 61620651 is 15602616.

It is a happy number.

61620651 is a `hidden beast` number, since 6 + 1 + 6 + 2 + 0 + 651 = 666.

61620651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61620651 - 2¹ = 61620649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61620451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69825 + ... + 70701.

Almost surely, 2^61620651 is an apocalyptic number.

61620651 is a deficient number, since it is larger than the sum of its proper divisors (30330533).

61620651 is a wasteful number, since it uses less digits than its factorization.

61620651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1131 (or 1128 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 61620651 is about 7849.8822284159. The cubic root of 61620651 is about 394.9802927731.

The spelling of 61620651 in words is "sixty-one million, six hundred twenty thousand, six hundred fifty-one".