231648649 has 2 divisors, whose sum is σ = 231648650. Its totient is φ = 231648648.

The previous prime is 231648587. The next prime is 231648689. The reversal of 231648649 is 946846132.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 209323024 + 22325625 = 14468^2 + 4725^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231648649 is a prime.

It is a super-2 number, since 2×231648649² = 107322193167050402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (231648689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115824324 + 115824325.

It is an arithmetic number, because the mean of its divisors is an integer number (115824325).

Almost surely, 2^231648649 is an apocalyptic number.

It is an amenable number.

231648649 is a deficient number, since it is larger than the sum of its proper divisors (1).

231648649 is an equidigital number, since it uses as much as digits as its factorization.

231648649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 43.

The square root of 231648649 is about 15220.0081800241. The cubic root of 231648649 is about 614.1530183050.

It can be divided in two parts, 23164 and 8649, that added together give a palindrome (31813).

The spelling of 231648649 in words is "two hundred thirty-one million, six hundred forty-eight thousand, six hundred forty-nine".