631548121 has 2 divisors, whose sum is σ = 631548122. Its totient is φ = 631548120.

The previous prime is 631548103. The next prime is 631548139. The reversal of 631548121 is 121845136.

It is a balanced prime because it is at equal distance from previous prime (631548103) and next prime (631548139).

It can be written as a sum of positive squares in only one way, i.e., 616032400 + 15515721 = 24820^2 + 3939^2 .

It is a cyclic number.

It is not a de Polignac number, because 631548121 - 2¹³ = 631539929 is a prime.

It is not a weakly prime, because it can be changed into another prime (631548101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315774060 + 315774061.

It is an arithmetic number, because the mean of its divisors is an integer number (315774061).

Almost surely, 2^631548121 is an apocalyptic number.

It is an amenable number.

631548121 is a deficient number, since it is larger than the sum of its proper divisors (1).

631548121 is an equidigital number, since it uses as much as digits as its factorization.

631548121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 31.

The square root of 631548121 is about 25130.6211821356. The cubic root of 631548121 is about 857.9635070320.

The spelling of 631548121 in words is "six hundred thirty-one million, five hundred forty-eight thousand, one hundred twenty-one".