634752121 has 2 divisors, whose sum is σ = 634752122. Its totient is φ = 634752120.

The previous prime is 634752113. The next prime is 634752127. The reversal of 634752121 is 121257436.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 633226896 + 1525225 = 25164^2 + 1235^2 .

It is a cyclic number.

It is not a de Polignac number, because 634752121 - 2³ = 634752113 is a prime.

It is a super-2 number, since 2×634752121² = 805820510227997282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (634752127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317376060 + 317376061.

It is an arithmetic number, because the mean of its divisors is an integer number (317376061).

Almost surely, 2^634752121 is an apocalyptic number.

It is an amenable number.

634752121 is a deficient number, since it is larger than the sum of its proper divisors (1).

634752121 is an equidigital number, since it uses as much as digits as its factorization.

634752121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 31.

The square root of 634752121 is about 25194.2874675987. The cubic root of 634752121 is about 859.4119474601.

The spelling of 634752121 in words is "six hundred thirty-four million, seven hundred fifty-two thousand, one hundred twenty-one".