75621137 has 4 divisors (see below), whose sum is σ = 75640356. Its totient is φ = 75601920.

The previous prime is 75621127. The next prime is 75621149. The reversal of 75621137 is 73112657.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9296401 + 66324736 = 3049^2 + 8144^2 .

It is a cyclic number.

It is not a de Polignac number, because 75621137 - 2¹² = 75617041 is a prime.

It is a super-2 number, since 2×75621137² = 11437112722345538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75621127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1328 + ... + 12369.

It is an arithmetic number, because the mean of its divisors is an integer number (18910089).

Almost surely, 2^75621137 is an apocalyptic number.

It is an amenable number.

75621137 is a deficient number, since it is larger than the sum of its proper divisors (19219).

75621137 is a wasteful number, since it uses less digits than its factorization.

75621137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19218.

The product of its digits is 8820, while the sum is 32.

The square root of 75621137 is about 8696.0414557430. The cubic root of 75621137 is about 422.8773273294.

The spelling of 75621137 in words is "seventy-five million, six hundred twenty-one thousand, one hundred thirty-seven".