51861901 has 32 divisors (see below), whose sum is σ = 66768128. Its totient is φ = 39191040.

The previous prime is 51861899. The next prime is 51861907. The reversal of 51861901 is 10916815.

It is not a de Polignac number, because 51861901 - 2¹ = 51861899 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51861907) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 245686 + ... + 245896.

It is an arithmetic number, because the mean of its divisors is an integer number (2086504).

Almost surely, 2^51861901 is an apocalyptic number.

It is an amenable number.

51861901 is a deficient number, since it is larger than the sum of its proper divisors (14906227).

51861901 is a wasteful number, since it uses less digits than its factorization.

51861901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341.

The product of its (nonzero) digits is 2160, while the sum is 31.

The square root of 51861901 is about 7201.5207421766. The cubic root of 51861901 is about 372.9204021944.

The spelling of 51861901 in words is "fifty-one million, eight hundred sixty-one thousand, nine hundred one".