55403951 has 4 divisors (see below), whose sum is σ = 55536600. Its totient is φ = 55271304.

The previous prime is 55403939. The next prime is 55403963. The reversal of 55403951 is 15930455.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (55403939) and next prime (55403963).

It is a cyclic number.

It is not a de Polignac number, because 55403951 - 2¹⁰ = 55402927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55403351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65696 + ... + 66533.

It is an arithmetic number, because the mean of its divisors is an integer number (13884150).

Almost surely, 2^55403951 is an apocalyptic number.

55403951 is a deficient number, since it is larger than the sum of its proper divisors (132649).

55403951 is a wasteful number, since it uses less digits than its factorization.

55403951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132648.

The product of its (nonzero) digits is 13500, while the sum is 32.

The square root of 55403951 is about 7443.3830346154. The cubic root of 55403951 is about 381.2240101964.

The spelling of 55403951 in words is "fifty-five million, four hundred three thousand, nine hundred fifty-one".