625071981 has 8 divisors (see below), whose sum is σ = 835903744. Its totient is φ = 415477440.

The previous prime is 625071971. The next prime is 625072027. The reversal of 625071981 is 189170526.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 625071981 - 2⁵ = 625071949 is a prime.

It is a super-2 number, since 2×625071981² = 781429962862528722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625071971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 308125 + ... + 310146.

It is an arithmetic number, because the mean of its divisors is an integer number (104487968).

Almost surely, 2^625071981 is an apocalyptic number.

It is an amenable number.

625071981 is a deficient number, since it is larger than the sum of its proper divisors (210831763).

625071981 is a wasteful number, since it uses less digits than its factorization.

625071981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618611.

The product of its (nonzero) digits is 30240, while the sum is 39.

The square root of 625071981 is about 25001.4395785523. The cubic root of 625071981 is about 855.0207949527.

The spelling of 625071981 in words is "six hundred twenty-five million, seventy-one thousand, nine hundred eighty-one".