155402131 has 2 divisors, whose sum is σ = 155402132. Its totient is φ = 155402130.

The previous prime is 155402111. The next prime is 155402141. The reversal of 155402131 is 131204551.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 155402131 - 2¹³ = 155393939 is a prime.

It is a super-2 number, since 2×155402131² = 48299644638682322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (155402111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77701065 + 77701066.

It is an arithmetic number, because the mean of its divisors is an integer number (77701066).

Almost surely, 2^155402131 is an apocalyptic number.

155402131 is a deficient number, since it is larger than the sum of its proper divisors (1).

155402131 is an equidigital number, since it uses as much as digits as its factorization.

155402131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 155402131 is about 12466.0391063080. The cubic root of 155402131 is about 537.6326765317.

Adding to 155402131 its reverse (131204551), we get a palindrome (286606682).

It can be divided in two parts, 15540 and 2131, that added together give a palindrome (17671).

The spelling of 155402131 in words is "one hundred fifty-five million, four hundred two thousand, one hundred thirty-one".