55121951 has 6 divisors (see below), whose sum is σ = 55430856. Its totient is φ = 54814200.

The previous prime is 55121947. The next prime is 55121959. The reversal of 55121951 is 15912155.

It is not a de Polignac number, because 55121951 - 2² = 55121947 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55121959) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 130721 + ... + 131141.

It is an arithmetic number, because the mean of its divisors is an integer number (9238476).

Almost surely, 2^55121951 is an apocalyptic number.

55121951 is a deficient number, since it is larger than the sum of its proper divisors (308905).

55121951 is an frugal number, since it uses more digits than its factorization.

55121951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1153 (or 732 counting only the distinct ones).

The product of its digits is 2250, while the sum is 29.

The square root of 55121951 is about 7424.4158692789. The cubic root of 55121951 is about 380.5761136539.

The spelling of 55121951 in words is "fifty-five million, one hundred twenty-one thousand, nine hundred fifty-one".