55331331 has 16 divisors (see below), whose sum is σ = 81804288. Its totient is φ = 32983200.

The previous prime is 55331327. The next prime is 55331351. The reversal of 55331331 is 13313355.

It is not a de Polignac number, because 55331331 - 2² = 55331327 is a prime.

It is a super-2 number, since 2×55331331² = 6123112380463122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55331351) 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, 11731 + ... + 15756.

It is an arithmetic number, because the mean of its divisors is an integer number (5112768).

Almost surely, 2^55331331 is an apocalyptic number.

55331331 is a deficient number, since it is larger than the sum of its proper divisors (26472957).

55331331 is a wasteful number, since it uses less digits than its factorization.

55331331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27562.

The product of its digits is 2025, while the sum is 24.

The square root of 55331331 is about 7438.5032768696. The cubic root of 55331331 is about 381.0573759184.

Adding to 55331331 its reverse (13313355), we get a palindrome (68644686).

The spelling of 55331331 in words is "fifty-five million, three hundred thirty-one thousand, three hundred thirty-one".