51091425 has 96 divisors (see below), whose sum is σ = 117135360. Its totient is φ = 21211200.

The previous prime is 51091423. The next prime is 51091427. The reversal of 51091425 is 52419015.

51091425 is a `hidden beast` number, since 510 + 9 + 142 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (51091423) and next prime (51091427).

It is not a de Polignac number, because 51091425 - 2¹ = 51091423 is a prime.

It is a super-2 number, since 2×51091425² = 5220667417061250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (51091423) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 51484 + ... + 52466.

It is an arithmetic number, because the mean of its divisors is an integer number (1220160).

Almost surely, 2^51091425 is an apocalyptic number.

51091425 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51091425 is an abundant number, since it is smaller than the sum of its proper divisors (66043935).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51091425 is a wasteful number, since it uses less digits than its factorization.

51091425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020 (or 1009 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 51091425 is about 7147.8265927483. The cubic root of 51091425 is about 371.0644415006.

The spelling of 51091425 in words is "fifty-one million, ninety-one thousand, four hundred twenty-five".