55250991 has 40 divisors (see below), whose sum is σ = 88095744. Its totient is φ = 34428240.

The previous prime is 55250989. The next prime is 55251013. The reversal of 55250991 is 19905255.

It is not a de Polignac number, because 55250991 - 2¹ = 55250989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55250981) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 87246 + ... + 87876.

Almost surely, 2^55250991 is an apocalyptic number.

55250991 is a deficient number, since it is larger than the sum of its proper divisors (32844753).

55250991 is a wasteful number, since it uses less digits than its factorization.

55250991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713 (or 704 counting only the distinct ones).

The product of its (nonzero) digits is 20250, while the sum is 36.

The square root of 55250991 is about 7433.1010352342. The cubic root of 55250991 is about 380.8728573220.

The spelling of 55250991 in words is "fifty-five million, two hundred fifty thousand, nine hundred ninety-one".