51402557 has 4 divisors (see below), whose sum is σ = 53060736. Its totient is φ = 49744380.

The previous prime is 51402553. The next prime is 51402563. The reversal of 51402557 is 75520415.

51402557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51402557 - 2² = 51402553 is a prime.

It is a super-2 number, since 2×51402557² = 5284445732276498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51402551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 829043 + ... + 829104.

It is an arithmetic number, because the mean of its divisors is an integer number (13265184).

Almost surely, 2^51402557 is an apocalyptic number.

It is an amenable number.

51402557 is a deficient number, since it is larger than the sum of its proper divisors (1658179).

51402557 is a wasteful number, since it uses less digits than its factorization.

51402557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1658178.

The product of its (nonzero) digits is 7000, while the sum is 29.

The square root of 51402557 is about 7169.5576572059. The cubic root of 51402557 is about 371.8161427176.

The spelling of 51402557 in words is "fifty-one million, four hundred two thousand, five hundred fifty-seven".