74021531 has 4 divisors (see below), whose sum is σ = 74554200. Its totient is φ = 73488864.

The previous prime is 74021509. The next prime is 74021539. The reversal of 74021531 is 13512047.

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 74021531 - 2¹⁴ = 74005147 is a prime.

It is a super-2 number, since 2×74021531² = 10958374103167922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 74021497 and 74021506.

It is not an unprimeable number, because it can be changed into a prime (74021539) 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, 266126 + ... + 266403.

It is an arithmetic number, because the mean of its divisors is an integer number (18638550).

Almost surely, 2^74021531 is an apocalyptic number.

74021531 is a deficient number, since it is larger than the sum of its proper divisors (532669).

74021531 is a wasteful number, since it uses less digits than its factorization.

74021531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532668.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 74021531 is about 8603.5766399794. The cubic root of 74021531 is about 419.8743596225.

Adding to 74021531 its reverse (13512047), we get a palindrome (87533578).

The spelling of 74021531 in words is "seventy-four million, twenty-one thousand, five hundred thirty-one".