1621750425 has 24 divisors (see below), whose sum is σ = 2693134176. Its totient is φ = 861114240.

The previous prime is 1621750409. The next prime is 1621750457. The reversal of 1621750425 is 5240571261.

It is not a de Polignac number, because 1621750425 - 2⁴ = 1621750409 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30604 + ... + 64653.

It is an arithmetic number, because the mean of its divisors is an integer number (112213924).

Almost surely, 2^1621750425 is an apocalyptic number.

1621750425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1621750425 is a deficient number, since it is larger than the sum of its proper divisors (1071383751).

1621750425 is a wasteful number, since it uses less digits than its factorization.

1621750425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95497 (or 95492 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 1621750425 is about 40270.9625536813. The cubic root of 1621750425 is about 1174.8831451619.

The spelling of 1621750425 in words is "one billion, six hundred twenty-one million, seven hundred fifty thousand, four hundred twenty-five".