155015442 has 12 divisors (see below), whose sum is σ = 335866830. Its totient is φ = 51671808.

The previous prime is 155015431. The next prime is 155015449. The reversal of 155015442 is 244510551.

It can be written as a sum of positive squares in only one way, i.e., 139499721 + 15515721 = 11811^2 + 3939^2 .

It is not an unprimeable number, because it can be changed into a prime (155015449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4305967 + ... + 4306002.

Almost surely, 2^155015442 is an apocalyptic number.

155015442 is an abundant number, since it is smaller than the sum of its proper divisors (180851388).

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

155015442 is a wasteful number, since it uses less digits than its factorization.

155015442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8611977 (or 8611974 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 155015442 is about 12450.5197481872. The cubic root of 155015442 is about 537.1863735183.

Adding to 155015442 its reverse (244510551), we get a palindrome (399525993).

The spelling of 155015442 in words is "one hundred fifty-five million, fifteen thousand, four hundred forty-two".