22001531537 has 2 divisors, whose sum is σ = 22001531538. Its totient is φ = 22001531536.

The previous prime is 22001531533. The next prime is 22001531549. The reversal of 22001531537 is 73513510022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18051534736 + 3949996801 = 134356^2 + 62849^2 .

It is a cyclic number.

It is not a de Polignac number, because 22001531537 - 2² = 22001531533 is a prime.

It is not a weakly prime, because it can be changed into another prime (22001531533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11000765768 + 11000765769.

It is an arithmetic number, because the mean of its divisors is an integer number (11000765769).

Almost surely, 2^22001531537 is an apocalyptic number.

It is an amenable number.

22001531537 is a deficient number, since it is larger than the sum of its proper divisors (1).

22001531537 is an equidigital number, since it uses as much as digits as its factorization.

22001531537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6300, while the sum is 29.

The spelling of 22001531537 in words is "twenty-two billion, one million, five hundred thirty-one thousand, five hundred thirty-seven".