70741981 has 8 divisors (see below), whose sum is σ = 75592440. Its totient is φ = 65968128.

The previous prime is 70741973. The next prime is 70741987. The reversal of 70741981 is 18914707.

It can be written as a sum of positive squares in 4 ways, for example, as 8173881 + 62568100 = 2859^2 + 7910^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 70741981 - 2³ = 70741973 is a prime.

It is a super-2 number, since 2×70741981² = 10008855751608722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 70741981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70741987) 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, 17236 + ... + 20941.

It is an arithmetic number, because the mean of its divisors is an integer number (9449055).

Almost surely, 2^70741981 is an apocalyptic number.

It is an amenable number.

70741981 is a deficient number, since it is larger than the sum of its proper divisors (4850459).

70741981 is a wasteful number, since it uses less digits than its factorization.

70741981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38303.

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 70741981 is about 8410.8252270511. The cubic root of 70741981 is about 413.5795653181.

The spelling of 70741981 in words is "seventy million, seven hundred forty-one thousand, nine hundred eighty-one".