75401561 has 4 divisors (see below), whose sum is σ = 75477300. Its totient is φ = 75325824.

The previous prime is 75401549. The next prime is 75401569. The reversal of 75401561 is 16510457.

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 27237961 + 48163600 = 5219^2 + 6940^2 .

It is a cyclic number.

It is not a de Polignac number, because 75401561 - 2⁶ = 75401497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (75401569) 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, 36356 + ... + 38373.

It is an arithmetic number, because the mean of its divisors is an integer number (18869325).

Almost surely, 2^75401561 is an apocalyptic number.

It is an amenable number.

75401561 is a deficient number, since it is larger than the sum of its proper divisors (75739).

75401561 is a wasteful number, since it uses less digits than its factorization.

75401561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75738.

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 75401561 is about 8683.4072229742. The cubic root of 75401561 is about 422.4676370762.

The spelling of 75401561 in words is "seventy-five million, four hundred one thousand, five hundred sixty-one".