151978 has 4 divisors (see below), whose sum is σ = 227970. Its totient is φ = 75988.

The previous prime is 151969. The next prime is 152003. The reversal of 151978 is 879151.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 149769 + 2209 = 387^2 + 47^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37993 + ... + 37996.

2¹⁵¹⁹⁷⁸ is an apocalyptic number.

151978 is a deficient number, since it is larger than the sum of its proper divisors (75992).

151978 is an equidigital number, since it uses as much as digits as its factorization.

151978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75991.

The product of its digits is 2520, while the sum is 31.

The square root of 151978 is about 389.8435583667. The cubic root of 151978 is about 53.3654580767.

The spelling of 151978 in words is "one hundred fifty-one thousand, nine hundred seventy-eight".