55213961 has 16 divisors (see below), whose sum is σ = 63192960. Its totient is φ = 47752320.

The previous prime is 55213937. The next prime is 55213993. The reversal of 55213961 is 16931255.

It is not a de Polignac number, because 55213961 - 2⁶ = 55213897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55213901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57461 + ... + 58413.

It is an arithmetic number, because the mean of its divisors is an integer number (3949560).

Almost surely, 2^55213961 is an apocalyptic number.

It is an amenable number.

55213961 is a deficient number, since it is larger than the sum of its proper divisors (7978999).

55213961 is a wasteful number, since it uses less digits than its factorization.

55213961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1216.

The product of its digits is 8100, while the sum is 32.

The square root of 55213961 is about 7430.6097327205. The cubic root of 55213961 is about 380.7877495037.

The spelling of 55213961 in words is "fifty-five million, two hundred thirteen thousand, nine hundred sixty-one".