1401661481 has 16 divisors (see below), whose sum is σ = 1553043456. Its totient is φ = 1254330000.

The previous prime is 1401661463. The next prime is 1401661489. The reversal of 1401661481 is 1841661041.

It is a de Polignac number, because none of the positive numbers 2^k-1401661481 is a prime.

It is a super-2 number, since 2×1401661481² = 3929309814638226722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1401661489) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 773066 + ... + 774876.

It is an arithmetic number, because the mean of its divisors is an integer number (97065216).

Almost surely, 2^1401661481 is an apocalyptic number.

1401661481 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1401661481 is a deficient number, since it is larger than the sum of its proper divisors (151381975).

1401661481 is a wasteful number, since it uses less digits than its factorization.

1401661481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2884.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 1401661481 is about 37438.7697580997. The cubic root of 1401661481 is about 1119.1313100885.

The spelling of 1401661481 in words is "one billion, four hundred one million, six hundred sixty-one thousand, four hundred eighty-one".