1401531550 has 24 divisors (see below), whose sum is σ = 2632668552. Its totient is φ = 555060000.

The previous prime is 1401531533. The next prime is 1401531553. The reversal of 1401531550 is 551351041.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1401531553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 133716 + ... + 143815.

It is an arithmetic number, because the mean of its divisors is an integer number (109694523).

Almost surely, 2^1401531550 is an apocalyptic number.

1401531550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1401531550 is a deficient number, since it is larger than the sum of its proper divisors (1231137002).

1401531550 is a wasteful number, since it uses less digits than its factorization.

1401531550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277644 (or 277639 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 1401531550 is about 37437.0344712292. The cubic root of 1401531550 is about 1119.0967286660.

Adding to 1401531550 its reverse (551351041), we get a palindrome (1952882591).

The spelling of 1401531550 in words is "one billion, four hundred one million, five hundred thirty-one thousand, five hundred fifty".