75142981 has 2 divisors, whose sum is σ = 75142982. Its totient is φ = 75142980.

The previous prime is 75142957. The next prime is 75143023. The reversal of 75142981 is 18924157.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74666881 + 476100 = 8641^2 + 690^2 .

It is a cyclic number.

It is not a de Polignac number, because 75142981 - 2²¹ = 73045829 is a prime.

It is a super-2 number, since 2×75142981² = 11292935187132722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 75142981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75142901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37571490 + 37571491.

It is an arithmetic number, because the mean of its divisors is an integer number (37571491).

Almost surely, 2^75142981 is an apocalyptic number.

It is an amenable number.

75142981 is a deficient number, since it is larger than the sum of its proper divisors (1).

75142981 is an equidigital number, since it uses as much as digits as its factorization.

75142981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 37.

The square root of 75142981 is about 8668.5051191079. The cubic root of 75142981 is about 421.9841510785.

The spelling of 75142981 in words is "seventy-five million, one hundred forty-two thousand, nine hundred eighty-one".