70935981 has 4 divisors (see below), whose sum is σ = 94581312. Its totient is φ = 47290652.

The previous prime is 70935973. The next prime is 70935989. The reversal of 70935981 is 18953907.

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 an interprime number because it is at equal distance from previous prime (70935973) and next prime (70935989).

It is a cyclic number.

It is not a de Polignac number, because 70935981 - 2³ = 70935973 is a prime.

It is a super-2 number, since 2×70935981² = 10063826800864722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70935989) 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, 11822661 + ... + 11822666.

It is an arithmetic number, because the mean of its divisors is an integer number (23645328).

Almost surely, 2^70935981 is an apocalyptic number.

It is an amenable number.

70935981 is a deficient number, since it is larger than the sum of its proper divisors (23645331).

70935981 is a wasteful number, since it uses less digits than its factorization.

70935981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23645330.

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 70935981 is about 8422.3500877130. The cubic root of 70935981 is about 413.9572816433.

The spelling of 70935981 in words is "seventy million, nine hundred thirty-five thousand, nine hundred eighty-one".