51091395 has 16 divisors (see below), whose sum is σ = 85300992. Its totient is φ = 26063840.

The previous prime is 51091393. The next prime is 51091423. The reversal of 51091395 is 59319015.

It is not a de Polignac number, because 51091395 - 2¹ = 51091393 is a prime.

It is a super-2 number, since 2×51091395² = 5220661286092050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51091393) 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, 73701 + ... + 74390.

It is an arithmetic number, because the mean of its divisors is an integer number (5331312).

Almost surely, 2^51091395 is an apocalyptic number.

51091395 is a deficient number, since it is larger than the sum of its proper divisors (34209597).

51091395 is a wasteful number, since it uses less digits than its factorization.

51091395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148122.

The product of its (nonzero) digits is 6075, while the sum is 33.

The square root of 51091395 is about 7147.8244942080. The cubic root of 51091395 is about 371.0643688731.

The spelling of 51091395 in words is "fifty-one million, ninety-one thousand, three hundred ninety-five".