61621025 has 24 divisors (see below), whose sum is σ = 82328064. Its totient is φ = 45619200.

The previous prime is 61621003. The next prime is 61621057. The reversal of 61621025 is 52012616.

It is not a de Polignac number, because 61621025 - 2⁶ = 61620961 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16097 + ... + 19553.

It is an arithmetic number, because the mean of its divisors is an integer number (3430336).

Almost surely, 2^61621025 is an apocalyptic number.

It is an amenable number.

61621025 is a deficient number, since it is larger than the sum of its proper divisors (20707039).

61621025 is a wasteful number, since it uses less digits than its factorization.

61621025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3521 (or 3516 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 61621025 is about 7849.9060503932. The cubic root of 61621025 is about 394.9810918685.

The spelling of 61621025 in words is "sixty-one million, six hundred twenty-one thousand, twenty-five".