70091631 has 6 divisors (see below), whose sum is σ = 101243480. Its totient is φ = 46727748.

The previous prime is 70091611. The next prime is 70091641. The reversal of 70091631 is 13619007.

It is not a de Polignac number, because 70091631 - 2¹¹ = 70089583 is a prime.

It is a super-2 number, since 2×70091631² = 9825673472480322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 70091595 and 70091604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70091611) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3893971 + ... + 3893988.

Almost surely, 2^70091631 is an apocalyptic number.

70091631 is a deficient number, since it is larger than the sum of its proper divisors (31151849).

70091631 is a wasteful number, since it uses less digits than its factorization.

70091631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7787965 (or 7787962 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 27.

The square root of 70091631 is about 8372.0744741074. The cubic root of 70091631 is about 412.3082789501.

The spelling of 70091631 in words is "seventy million, ninety-one thousand, six hundred thirty-one".