70102981 has 4 divisors (see below), whose sum is σ = 75495532. Its totient is φ = 64710432.

The previous prime is 70102961. The next prime is 70102993. The reversal of 70102981 is 18920107.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21242881 + 48860100 = 4609^2 + 6990^2 .

It is a cyclic number.

It is not a de Polignac number, because 70102981 - 2⁹ = 70102469 is a prime.

It is a super-2 number, since 2×70102981² = 9828855890172722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70102961) 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, 2696256 + ... + 2696281.

It is an arithmetic number, because the mean of its divisors is an integer number (18873883).

Almost surely, 2^70102981 is an apocalyptic number.

It is an amenable number.

70102981 is a deficient number, since it is larger than the sum of its proper divisors (5392551).

70102981 is a wasteful number, since it uses less digits than its factorization.

70102981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5392550.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 70102981 is about 8372.7522953925. The cubic root of 70102981 is about 412.3305328974.

The spelling of 70102981 in words is "seventy million, one hundred two thousand, nine hundred eighty-one".