201651631 has 2 divisors, whose sum is σ = 201651632. Its totient is φ = 201651630.

The previous prime is 201651613. The next prime is 201651641. The reversal of 201651631 is 136156102.

Together with previous prime (201651613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201651631 - 2⁵ = 201651599 is a prime.

It is a super-2 number, since 2×201651631² = 81326760569920322, which contains 22 as substring.

It is equal to p_11165353 and since 201651631 and 11165353 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 201651596 and 201651605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201651641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100825815 + 100825816.

It is an arithmetic number, because the mean of its divisors is an integer number (100825816).

Almost surely, 2^201651631 is an apocalyptic number.

201651631 is a deficient number, since it is larger than the sum of its proper divisors (1).

201651631 is an equidigital number, since it uses as much as digits as its factorization.

201651631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 201651631 is about 14200.4095363479. The cubic root of 201651631 is about 586.4089359842.

The spelling of 201651631 in words is "two hundred one million, six hundred fifty-one thousand, six hundred thirty-one".