22315981 has 4 divisors (see below), whose sum is σ = 22486464. Its totient is φ = 22145500.

The previous prime is 22315973. The next prime is 22315987. The reversal of 22315981 is 18951322.

22315981 = 346² + 347² + ... + 476².

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 a cyclic number.

It is not a de Polignac number, because 22315981 - 2³ = 22315973 is a prime.

It is a super-3 number, since 3×22315981³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22315987) 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, 85045 + ... + 85306.

It is an arithmetic number, because the mean of its divisors is an integer number (5621616).

Almost surely, 2^22315981 is an apocalyptic number.

It is an amenable number.

22315981 is a deficient number, since it is larger than the sum of its proper divisors (170483).

22315981 is a wasteful number, since it uses less digits than its factorization.

22315981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170482.

The product of its digits is 4320, while the sum is 31.

The square root of 22315981 is about 4723.9793606662. The cubic root of 22315981 is about 281.5390630684.

The spelling of 22315981 in words is "twenty-two million, three hundred fifteen thousand, nine hundred eighty-one".