155231442 has 12 divisors (see below), whose sum is σ = 336334830. Its totient is φ = 51743808.

The previous prime is 155231441. The next prime is 155231509. The reversal of 155231442 is 244132551.

It can be written as a sum of positive squares in only one way, i.e., 155226681 + 4761 = 12459^2 + 69^2 .

It is not an unprimeable number, because it can be changed into a prime (155231441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4311967 + ... + 4312002.

Almost surely, 2^155231442 is an apocalyptic number.

155231442 is an abundant number, since it is smaller than the sum of its proper divisors (181103388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155231442 is a wasteful number, since it uses less digits than its factorization.

155231442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8623977 (or 8623974 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 155231442 is about 12459.1910652337. The cubic root of 155231442 is about 537.4357645970.

Adding to 155231442 its reverse (244132551), we get a palindrome (399363993).

The spelling of 155231442 in words is "one hundred fifty-five million, two hundred thirty-one thousand, four hundred forty-two".