155431402 has 16 divisors (see below), whose sum is σ = 267099840. Its totient is φ = 66451968.

The previous prime is 155431399. The next prime is 155431403. The reversal of 155431402 is 204134551.

It is a happy number.

155431402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (155431403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7383 + ... + 19114.

It is an arithmetic number, because the mean of its divisors is an integer number (16693740).

Almost surely, 2^155431402 is an apocalyptic number.

155431402 is a deficient number, since it is larger than the sum of its proper divisors (111668438).

155431402 is a wasteful number, since it uses less digits than its factorization.

155431402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26925.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 155431402 is about 12467.2130807170. The cubic root of 155431402 is about 537.6664299473. Note that the first 3 decimals are identical.

Adding to 155431402 its reverse (204134551), we get a palindrome (359565953).

The spelling of 155431402 in words is "one hundred fifty-five million, four hundred thirty-one thousand, four hundred two".