122631261 has 4 divisors (see below), whose sum is σ = 163508352. Its totient is φ = 81754172.

The previous prime is 122631259. The next prime is 122631277. The reversal of 122631261 is 162136221.

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 122631261 - 2¹ = 122631259 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122631211) 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, 20438541 + ... + 20438546.

It is an arithmetic number, because the mean of its divisors is an integer number (40877088).

Almost surely, 2^122631261 is an apocalyptic number.

It is an amenable number.

122631261 is a deficient number, since it is larger than the sum of its proper divisors (40877091).

122631261 is an equidigital number, since it uses as much as digits as its factorization.

122631261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40877090.

The product of its digits is 864, while the sum is 24.

The square root of 122631261 is about 11073.8999905182. The cubic root of 122631261 is about 496.8215186613.

Adding to 122631261 its reverse (162136221), we get a palindrome (284767482).

The spelling of 122631261 in words is "one hundred twenty-two million, six hundred thirty-one thousand, two hundred sixty-one".