253139093981 has 8 divisors (see below), whose sum is σ = 257326168440. Its totient is φ = 248985923328.

The previous prime is 253139093959. The next prime is 253139094059. The reversal of 253139093981 is 189390931352.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 156812040025 + 96327053956 = 395995^2 + 310366^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 253139093981 - 2¹⁸ = 253138831837 is a prime.

It is a super-2 number, since 2×253139093981² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253139093941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8460896 + ... + 8490761.

It is an arithmetic number, because the mean of its divisors is an integer number (32165771055).

Almost surely, 2^253139093981 is an apocalyptic number.

It is an amenable number.

253139093981 is a deficient number, since it is larger than the sum of its proper divisors (4187074459).

253139093981 is a wasteful number, since it uses less digits than its factorization.

253139093981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16951903.

The product of its (nonzero) digits is 1574640, while the sum is 53.

The spelling of 253139093981 in words is "two hundred fifty-three billion, one hundred thirty-nine million, ninety-three thousand, nine hundred eighty-one".