70121279 has 4 divisors (see below), whose sum is σ = 71444376. Its totient is φ = 68798184.

The previous prime is 70121263. The next prime is 70121291. The reversal of 70121279 is 97212107.

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

It is a cyclic number.

It is not a de Polignac number, because 70121279 - 2⁴ = 70121263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70121239) 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, 661469 + ... + 661574.

It is an arithmetic number, because the mean of its divisors is an integer number (17861094).

Almost surely, 2^70121279 is an apocalyptic number.

70121279 is a deficient number, since it is larger than the sum of its proper divisors (1323097).

70121279 is a wasteful number, since it uses less digits than its factorization.

70121279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323096.

The product of its (nonzero) digits is 1764, while the sum is 29.

The square root of 70121279 is about 8373.8449352732. The cubic root of 70121279 is about 412.3664047326.

The spelling of 70121279 in words is "seventy million, one hundred twenty-one thousand, two hundred seventy-nine".