51121545 has 16 divisors (see below), whose sum is σ = 82547520. Its totient is φ = 27013824.

The previous prime is 51121537. The next prime is 51121549. The reversal of 51121545 is 54512115.

It is not a de Polignac number, because 51121545 - 2³ = 51121537 is a prime.

It is a super-2 number, since 2×51121545² = 5226824726374050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51121549) 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, 13999 + ... + 17268.

It is an arithmetic number, because the mean of its divisors is an integer number (5159220).

Almost surely, 2^51121545 is an apocalyptic number.

It is an amenable number.

51121545 is a deficient number, since it is larger than the sum of its proper divisors (31425975).

51121545 is a wasteful number, since it uses less digits than its factorization.

51121545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31384.

The product of its digits is 1000, while the sum is 24.

The square root of 51121545 is about 7149.9332164713. The cubic root of 51121545 is about 371.1373452244.

The spelling of 51121545 in words is "fifty-one million, one hundred twenty-one thousand, five hundred forty-five".