56891837 has 2 divisors, whose sum is σ = 56891838. Its totient is φ = 56891836.

The previous prime is 56891801. The next prime is 56891839. The reversal of 56891837 is 73819865.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53304601 + 3587236 = 7301^2 + 1894^2 .

It is a cyclic number.

It is not a de Polignac number, because 56891837 - 2¹⁴ = 56875453 is a prime.

It is a super-2 number, since 2×56891837² = 6473362234469138, which contains 22 as substring.

Together with 56891839, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 56891791 and 56891800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56891839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28445918 + 28445919.

It is an arithmetic number, because the mean of its divisors is an integer number (28445919).

Almost surely, 2^56891837 is an apocalyptic number.

It is an amenable number.

56891837 is a deficient number, since it is larger than the sum of its proper divisors (1).

56891837 is an equidigital number, since it uses as much as digits as its factorization.

56891837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 47.

The square root of 56891837 is about 7542.6677641270. The cubic root of 56891837 is about 384.6065289130.

The spelling of 56891837 in words is "fifty-six million, eight hundred ninety-one thousand, eight hundred thirty-seven".