1981070331 has 8 divisors (see below), whose sum is σ = 2641695504. Its totient is φ = 1320579360.

The previous prime is 1981070303. The next prime is 1981070347. The reversal of 1981070331 is 1330701891.

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

It is not a de Polignac number, because 1981070331 - 2¹⁸ = 1980808187 is a prime.

It is a super-2 number, since 2×1981070331² = 7849279312736899122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1981070292 and 1981070301.

It is not an unprimeable number, because it can be changed into a prime (1981071331) 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, 8385 + ... + 63501.

It is an arithmetic number, because the mean of its divisors is an integer number (330211938).

Almost surely, 2^1981070331 is an apocalyptic number.

1981070331 is a deficient number, since it is larger than the sum of its proper divisors (660625173).

1981070331 is a wasteful number, since it uses less digits than its factorization.

1981070331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67101.

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 1981070331 is about 44509.2162478739. The cubic root of 1981070331 is about 1255.9334612792.

The spelling of 1981070331 in words is "one billion, nine hundred eighty-one million, seventy thousand, three hundred thirty-one".