55557631 has 2 divisors, whose sum is σ = 55557632. Its totient is φ = 55557630.

The previous prime is 55557617. The next prime is 55557643. The reversal of 55557631 is 13675555.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55557631 - 2¹⁵ = 55524863 is a prime.

It is a super-2 number, since 2×55557631² = 6173300724664322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55557661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27778815 + 27778816.

It is an arithmetic number, because the mean of its divisors is an integer number (27778816).

Almost surely, 2^55557631 is an apocalyptic number.

55557631 is a deficient number, since it is larger than the sum of its proper divisors (1).

55557631 is an equidigital number, since it uses as much as digits as its factorization.

55557631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78750, while the sum is 37.

The square root of 55557631 is about 7453.6991487449. The cubic root of 55557631 is about 381.5761657069.

The spelling of 55557631 in words is "fifty-five million, five hundred fifty-seven thousand, six hundred thirty-one".