70938581 has 4 divisors (see below), whose sum is σ = 81072672. Its totient is φ = 60804492.

The previous prime is 70938559. The next prime is 70938587. The reversal of 70938581 is 18583907.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-70938581 is a prime.

It is a super-2 number, since 2×70938581² = 10064564548587122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70938587) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5067035 + ... + 5067048.

It is an arithmetic number, because the mean of its divisors is an integer number (20268168).

Almost surely, 2^70938581 is an apocalyptic number.

It is an amenable number.

70938581 is a deficient number, since it is larger than the sum of its proper divisors (10134091).

70938581 is a wasteful number, since it uses less digits than its factorization.

70938581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10134090.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 70938581 is about 8422.5044375174. The cubic root of 70938581 is about 413.9623391415.

The spelling of 70938581 in words is "seventy million, nine hundred thirty-eight thousand, five hundred eighty-one".