1301031981 has 12 divisors (see below), whose sum is σ = 1989813852. Its totient is φ = 816333696.

The previous prime is 1301031971. The next prime is 1301031983. The reversal of 1301031981 is 1891301031.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1028484900 + 272547081 = 32070^2 + 16509^2 .

It is not a de Polignac number, because 1301031981 - 2⁹ = 1301031469 is a prime.

It is a super-2 number, since 2×1301031981² = 3385368431169568722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1301031983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4251586 + ... + 4251891.

It is an arithmetic number, because the mean of its divisors is an integer number (165817821).

Almost surely, 2^1301031981 is an apocalyptic number.

It is an amenable number.

1301031981 is a deficient number, since it is larger than the sum of its proper divisors (688781871).

1301031981 is a wasteful number, since it uses less digits than its factorization.

1301031981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8503500 (or 8503497 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 1301031981 is about 36069.8209172155. The cubic root of 1301031981 is about 1091.6816007073.

The spelling of 1301031981 in words is "one billion, three hundred one million, thirty-one thousand, nine hundred eighty-one".