216137401 has 2 divisors, whose sum is σ = 216137402. Its totient is φ = 216137400.

The previous prime is 216137381. The next prime is 216137413. The reversal of 216137401 is 104731612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175827600 + 40309801 = 13260^2 + 6349^2 .

It is a cyclic number.

It is not a de Polignac number, because 216137401 - 2¹³ = 216129209 is a prime.

It is a super-2 number, since 2×216137401² = 93430752222069602, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (216137431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108068700 + 108068701.

It is an arithmetic number, because the mean of its divisors is an integer number (108068701).

Almost surely, 2^216137401 is an apocalyptic number.

It is an amenable number.

216137401 is a deficient number, since it is larger than the sum of its proper divisors (1).

216137401 is an equidigital number, since it uses as much as digits as its factorization.

216137401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 216137401 is about 14701.6121905048. The cubic root of 216137401 is about 600.1271961815.

The spelling of 216137401 in words is "two hundred sixteen million, one hundred thirty-seven thousand, four hundred one".