991059925 has 12 divisors (see below), whose sum is σ = 1268557696. Its totient is φ = 767271600.

The previous prime is 991059919. The next prime is 991059929. The reversal of 991059925 is 529950199.

It is a happy number.

It is not a de Polignac number, because 991059925 - 2¹⁵ = 991027157 is a prime.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991059929) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 638619 + ... + 640168.

Almost surely, 2^991059925 is an apocalyptic number.

It is an amenable number.

991059925 is a deficient number, since it is larger than the sum of its proper divisors (277497771).

991059925 is a wasteful number, since it uses less digits than its factorization.

991059925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1278828 (or 1278823 counting only the distinct ones).

The product of its (nonzero) digits is 328050, while the sum is 49.

The square root of 991059925 is about 31481.1042531865. The cubic root of 991059925 is about 997.0110500793.

The spelling of 991059925 in words is "nine hundred ninety-one million, fifty-nine thousand, nine hundred twenty-five".