51900091 has 8 divisors (see below), whose sum is σ = 52986960. Its totient is φ = 50817312.

The previous prime is 51900067. The next prime is 51900103. The reversal of 51900091 is 19000915.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51900091 - 2¹³ = 51891899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51900061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46245 + ... + 47353.

It is an arithmetic number, because the mean of its divisors is an integer number (6623370).

Almost surely, 2^51900091 is an apocalyptic number.

51900091 is a deficient number, since it is larger than the sum of its proper divisors (1086869).

51900091 is a wasteful number, since it uses less digits than its factorization.

51900091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2045.

The product of its (nonzero) digits is 405, while the sum is 25.

The square root of 51900091 is about 7204.1717775189. The cubic root of 51900091 is about 373.0119166172.

The spelling of 51900091 in words is "fifty-one million, nine hundred thousand, ninety-one".