55801231 has 2 divisors, whose sum is σ = 55801232. Its totient is φ = 55801230.

The previous prime is 55801211. The next prime is 55801237. The reversal of 55801231 is 13210855.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55801231 - 2⁵ = 55801199 is a prime.

It is a super-2 number, since 2×55801231² = 6227554762230722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55801196 and 55801205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55801237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27900615 + 27900616.

It is an arithmetic number, because the mean of its divisors is an integer number (27900616).

Almost surely, 2^55801231 is an apocalyptic number.

55801231 is a deficient number, since it is larger than the sum of its proper divisors (1).

55801231 is an equidigital number, since it uses as much as digits as its factorization.

55801231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 55801231 is about 7470.0221552550. The cubic root of 55801231 is about 382.1330434856.

The spelling of 55801231 in words is "fifty-five million, eight hundred one thousand, two hundred thirty-one".